1. Black smoke billowed over the city as students burned tires at spontaneous demonstrations.
2. At least 11 blazes burned across the city Thursday, including at historically black Dillard University where three buildings were destroyed.
3. Stacks of tires were dumped on the main road near the base and burned, sending clouds of black smoke billowing over the area.
4. They burned huge quantities of coal, their chimneys belching black smoke day and night.
5. US troops sealed off the area as the truck burned, sending clouds of black smoke into the sky.